Return-Path: X-Spam-DCC: paranoid 1233; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-1.4 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, HTML_MESSAGE,NO_REAL_NAME autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id u17NIeuE021014 for ; Mon, 8 Feb 2016 00:18:40 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1aSYYM-0003S8-HG for rs_out_1@blacksheep.org; Sun, 07 Feb 2016 23:15:38 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1aSYYM-0003Rz-3c for rsgb_lf_group@blacksheep.org; Sun, 07 Feb 2016 23:15:38 +0000 Received: from resqmta-ch2-01v.sys.comcast.net ([69.252.207.33]) by relay1.thorcom.net with esmtps (TLSv1.2:DHE-RSA-AES256-SHA:256) (Exim 4.86) (envelope-from ) id 1aSYXH-000273-I8 for rsgb_lf_group@blacksheep.org; Sun, 07 Feb 2016 23:15:37 +0000 Received: from resomta-ch2-16v.sys.comcast.net ([69.252.207.112]) by resqmta-ch2-01v.sys.comcast.net with comcast id FbCP1s0042S2Q5R01bDBeh; Sun, 07 Feb 2016 23:13:11 +0000 Received: from Owner ([IPv6:2601:141:1:c7e9:a1ab:1d71:dcb1:c1ad]) by resomta-ch2-16v.sys.comcast.net with comcast id FbDA1s00348RNwt01bDAio; Sun, 07 Feb 2016 23:13:11 +0000 X-DKIM-Result: Domain=comcast.net Result=Signature OK From: To: References: In-Reply-To: Date: Sun, 7 Feb 2016 18:12:58 -0500 Message-ID: <00a801d161fd$1b66ff10$5234fd30$@comcast.net> MIME-Version: 1.0 X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQIoj0jDgN1mE6io0sVsk882nKYcnp5y1izg Content-Language: en-us DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=comcast.net; s=q20140121; t=1454886791; bh=TClZgzV5zkE3CgEDjDBwqG1eT8S1jyLRvjca5H4TzMk=; h=Received:Received:From:To:Subject:Date:Message-ID:MIME-Version: Content-Type; b=D8viXGn9mDn+tAj7C+7oCHUIwILyyyBwBwsPV44AyBzNNullkor89fENdytJ2VATn dfWpkH4NK3n+X0CC+dBg+VimUez/awTuKp8DJMoXG7hYy71YJc20ssnLXTXIW3AK+a fsFH18EjL/fhg+huOzARAiiwy+qiicrgRtfjAzMnAsBYdG0Hdt3dPLACGYOQ2Q+zNb jHhNS9lXJGkWjeJfjQkwT7sPfDMwoB2sEBRK4ZsHhAELFI8+ikja4fljZW/Y//+DW4 9rKn58xrmo2HhT2oRio+AA8rELx8HQ3tRRby6ZyJDc810hrWiCENo3h6xxltpqtOkq tyGnfw7+p+d3Q== X-Scan-Signature: 47c6a76f4b07598cffe9c34bb9f40c3d Subject: LF: RE: Vlf ot Penguins and awesomes Content-Type: multipart/alternative; boundary="----=_NextPart_000_00A9_01D161D3.32927DB0" X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-Scanned-By: MIMEDefang 2.56 on 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 6749 This is a multipart message in MIME format. ------=_NextPart_000_00A9_01D161D3.32927DB0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Laurence, =20 Was that Harriman? Cohen? Said? Paschal? A number of folks from that = group have published on the AWESOME receiver design over the years, and = I have always meant to ask them about the transformer as none of their = publications are very specific about the transformer. I=E2=80=99ve = wondered about core, bobbin, gauge and layering attributes (re = intrawinding and interwinding capacitance) to the extent that those = attributes might affect frequency response and signal integrity for the = indicated antenna and preamp circuit. I talk with some of those folks = regularly so I=E2=80=99ll find out who among them can advise of any = transformer materials or winding requirements that are important to = noise isolation, signal integrity and response.=20 =20 73, =20 Jim AA5BW =20 =20 From: owner-rsgb_lf_group@blacksheep.org = [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Laurence KL7 L Sent: Sunday, February 7, 2016 5:33 PM To: rsgb_lf_group@blacksheep.org Subject: LF: Vlf ot Penguins and awesomes=20 =20 =20 =20 =20 VLf buffs=20 =20 Im presently Beta testing a Stanford VLF standard 5 turn 1 mH 1 ohm 10m = sided loop array and a test LNA. Im struggling with data on the = transformer which says its primary impedance is 10mH turns ratio of 16 = to match the appx 300ohm input Z of the bipolar device. I pinged the = author whose phd dissertation it was for actual design material but = presently "playing" with a pot core with 10mH primary and 40mH = secondary. Anyone have any info as this appears to a standard = "transformer" but critical to the LF attributes and sensitivity for the = awesome and other penguins designs out there =20 I think in going to be limited on 8kHz due to in ground dog fence = pulsing which now way up in level compared with the probe. But the main = loop is affixed near 0deg... =20 Ill continuing investigating... =20 Laurence KL7L =20 On Feb 7, 2016, at 12:10 AM, Markus Vester wrote: After the sequence, the carrier was on 8270.0025 again from 5:25:20 to = 8:35. Now QRT. =20 73, Markus =20 -----Urspr=C3=BCngliche Mitteilung-----=20 Von: Markus Vester An: rsgb_lf_group Verschickt: So, 7 Feb 2016 5:14 am Betreff: Re: VLF: EbNaut 8270.1 Sunday Just started another sequence with same parameters, running 04:00:02 to = 5:25:22 UT. =20 73, Markus =20 -----Urspr=C3=BCngliche Mitteilung-----=20 Von: Markus Vester An: rsgb_lf_group Verschickt: Sa, 6 Feb 2016 11:52 pm Betreff: Re: VLF: EbNaut 8270.1 Saturday Thanks once again Paul for your outstanding work. It is great to see = what you can make of such a feeble signal, so close to the ultimate SNR = limit. Thanks also Lubos and Stefan for continuously running and = maintaining your sensitive and useful grabbers. =20 Unfortunately VLF transmissions from here depend on a number of = circumstances, and they are not easy to predict and announce beforehand. = When I don't have to go to work, and if the wind stays calm, and the = weather is dry, and the static background is low, and none of my = neighbors complains about the beeps, I might try another one tonight or = tomorrow ;-)=20 =20 Best 73, Markus (DF6NM) =20 =20 -----Original Message----- From: Paul Nicholson To: rsgb_lf_group Sent: Sat, Feb 6, 2016 1:48 pm Subject: Re: VLF: EbNaut 8270.1 Saturday > Frequency: 8270.100 Hz,=20 > start time 9:00:02,=20 > 5 characters, 8K19A, 16 bit CRC, 10 second symbols,=20 Decoded 'DF6NM' at Eb/N0 =3D +0.3 dB, BER 36.5% which=20 is 67% of capacity.=20 Carrier 10:25 to 11:25 UT had flux density 0.05 fT=20 and S/N 11.4 dB using H-field alone. I combined=20 with E-field to get a couple more dB for the decode.=20 --=20 Paul Nicholson=20 --=20 =20 =20 =20 ------=_NextPart_000_00A9_01D161D3.32927DB0 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable

Laurence,

 

Was that Harriman? Cohen? Said? Paschal? A number of folks from that = group have published on the AWESOME receiver design over the years, and = I have always meant to ask them about the transformer as none of their = publications are very specific about the transformer. I=E2=80=99ve = wondered about core, bobbin, gauge and layering attributes (re = intrawinding and interwinding capacitance) to the extent that those = attributes might affect frequency response and signal integrity for the = indicated antenna and preamp circuit. I talk with some of those folks = regularly so I=E2=80=99ll find out who among them can advise of any = transformer materials or winding requirements that are important to = noise isolation, signal integrity and response.

 

73,

 

Jim AA5BW =C2=A0

 

From:= = owner-rsgb_lf_group@blacksheep.org = [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Laurence = KL7 L
Sent: Sunday, February 7, 2016 5:33 PM
To: = rsgb_lf_group@blacksheep.org
Subject: LF: Vlf ot Penguins and = awesomes

 

 

 

 

VLf buffs 

 

Im presently  Beta testing a Stanford VLF = standard 5 turn 1 mH 1 ohm 10m sided loop array and a test LNA. Im = struggling with data on the transformer which says its primary impedance = is 10mH turns ratio of 16 to match the appx 300ohm input Z of the = bipolar device. I pinged the author whose  phd dissertation it was = for actual design material but presently "playing" with a pot = core with 10mH primary and 40mH secondary. Anyone have any info as this = appears to a standard "transformer" but critical to the LF = attributes and sensitivity for the awesome and other penguins designs = out there

 

I = think in going to be limited on 8kHz due to in ground dog fence pulsing = which now way up in level compared with the probe. But the main loop is = affixed near 0deg...

 

Ill continuing = investigating...

 

Laurence KL7L

 


On Feb 7, 2016, at 12:10 AM, Markus = Vester <markusvester@aol.com> = wrote:

After the sequence, the carrier was on 8270.0025 = again from 5:25:20 to 8:35. Now QRT.

 

73, Markus


 

-----Urspr=C3=BCngliche Mitteilung----- =
Von: Markus Vester <markusvester@aol.com>
An: = rsgb_lf_group <rsgb_lf_group@blacksheep.org= >
Verschickt: So, 7 Feb 2016 5:14 am
Betreff: Re: VLF: = EbNaut 8270.1 Sunday

Just started another sequence with same = parameters, running 04:00:02 to 5:25:22 = UT.

 

73, Markus

 

-----Urspr=C3=BCngliche Mitteilung----- =
Von: Markus Vester <markusvester@aol.com>
An: = rsgb_lf_group <rsgb_lf_group@blacksheep.org= >
Verschickt: Sa, 6 Feb 2016 11:52 pm
Betreff: Re: VLF: = EbNaut 8270.1 Saturday

Thanks once again Paul for your = outstanding work. It is great to see what you can make of such = a feeble signal, so close to the ultimate SNR limit. Thanks = also Lubos and Stefan for continuously running and maintaining = your sensitive and useful grabbers.

 

Unfortunately VLF transmissions from here depend on a = number of circumstances, and they are not easy to predict and = announce beforehand. When I don't have to go to work, and if the = wind stays calm, and the weather is dry, and the static background = is low, and none of my neighbors complains about the beeps, I might = try another one tonight or tomorrow = ;-) 

 

Best 73,

Markus (DF6NM)

 


 

-----Original Message-----
From: Paul Nicholson = <vlf0403@abelian.org>
To: = rsgb_lf_group <rsgb_lf_group@blacksheep.org= >
Sent: Sat, Feb 6, 2016 1:48 pm
Subject: Re: VLF: EbNaut = 8270.1 Saturday

> = Frequency: 8270.100 Hz,
> start time 9:00:02, =
> 5 characters, 8K19A, 16 = bit CRC, 10 second symbols,

Decoded 'DF6NM' at Eb/N0 =3D = +0.3 dB, BER 36.5% which
is 67% of capacity. =

Carrier 10:25 to 11:25 UT had = flux density 0.05 fT
and S/N 11.4 dB using H-field = alone. I combined
with E-field to get a couple = more dB for the decode.

--
Paul Nicholson =
-- 
 
 
  =

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